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稀土组氨酸配合物的合成和性质研究 总被引:1,自引:0,他引:1
本文合成了十二个稀土与L-组氨酸(L-His)的固体配合物,元素分析结果表明配合物的组成为Ln(His)3(NO3)32H2O(Ln=Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Er,Tm)。并通过配合物的IR、UV、H-NMR、TG-DTA、磁化率及在水中的摩尔电导等的研究,表征了这些配合物的物理化学性质,结果表明稀土组氨配合物中配体通过羟基氧原子与镧系离子配位。 相似文献
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镧系四元混配化合物[Ln(BA)2(NO3)(phen)]2的合成,晶?… 总被引:1,自引:1,他引:0
在酸性介质,含水溶剂中合成了四元混配化合物「Ln(BA)2(NO3)(phen)」(BA=苯甲酸根;Ln=La,Ce,Pr,Nd,Sm,Eu,Dy,Gd,Tb,Er),用元素分析、IR、DTA_TG等方法对配合物进行了珠征,研究服配合物的顺磁性能和荧光性能,镨配合物的单晶衍射结果表明,配合物属三斜晶系,双核,Pr^3+的配位数为9,4个BA呈二种配位方式,丰富了四元配合物的结构表现形式。 相似文献
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制备了RECl3·3H2O(RE=Pr、Gd)与18C6的固态配合物,其化学组成为:RECl3·18C6·3H2O.对其进行了IR、溶解度、DTG和TG分析.推测了热分解机理.测量了298.15K时18C6及两种配合物在无水乙醇中的积分溶解热,以及RECl3·3H2O在18C6-C2H5OH溶液中的溶解配位热效应.依据本文所设计的热化学循环,求得了RECl3·3H2O(s)与18C6(S)生成RECl3·18C6·3H2O(S)的反应热及两种配合物的标准生成焓. 相似文献
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间羟基苯甲酸邻菲罗啉稀土三元配合物的合成,表征和抗菌活性研究 总被引:7,自引:1,他引:6
本语文用间羟基苯甲酸、邻菲罗啉与碳酸稀土合成了四种新的固体三元配合物,通过元素分析,摩尔电导、红外光谱、X射线粉末衍射、差热-热重分析了等手段,确定配合物的组成为:Ln(phen)L2,(Ln=La,Gd,Gy,Y1L=m-HO-C6H4COO^-),并对配合物的某些性质进行了研究。 相似文献
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合成了通式为K15H3〔Ce(P2W16VO61)2〕.61H2O、K15H4〔Ln(P2W16VO61)2〕.xH2O(Ln=La^3+,Pr^3+,Nd^3+,Sm^3+,Eu^3+,Gd^3+,Dy^3+,Yb^3+)的9种镧系元素Dawson结构的钨钒磷四元杂多配合物,并用IR、UV、NMR、ESR、XRD、TG-DTA等对其结构和性质进行子研究。该类配合物具有与K16〔Ce(P2W17O 相似文献
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The rare earth (RE=La, Y, Gd) salicylates were synthesized by the rheological phase reaction method. The complexes were characterized by elemental analysis, infrared spectra (IR), X-ray powder diffraction (XRD) and thermal gravity analysis (TG). They can be represented by general formula RE(HSal)3 (RE=La, Y, Gd; HSal=C6Ha(OH)COO). The crystals of them are monoclinic and have layered structure. The mechanism of thermal decomposition of rare earth salicylates was studied by using TG, DTA, IR and gas chromatography-mass spectrometry (GC-MS). The thermal decomposition of the rare earth salicylates in nitrogen gas proceeded in three stages: firstly, they were decomposed to form RE2(Sal)3 (Sal=C6H4OCOO) and salicylic acid; then, RE2(Sal)3 were decomposed further to form RE2O(CO3)2 and some organic compounds; finally, RE2O(CO3)2 were decomposed to form rare earth metal oxides (RE2O3) and carbon dioxide. The organic compounds obtained from the second step of the reaction are mainly dibenzofuran, xanthenone, 6H-benzo[c]chromen-6-one, 6-phenyl-6H-benzo[c]chromene, and 1,3-diphenyl-1, 3-dihydro-2-benzofuran. 相似文献
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The conditions of the formation of rare earth(III) 2,5-dihydroxybenzoates have been studied; their compositions and solubilities
in water at 293 K have been determined. The IR spectra of the anhydrous complexes with the general formula Ln(C7H5O4)3 have
been recorded and their thermal decompositions in static air determined. During heating the anhydrous complexes of Y, Pr-Lu
decompose to the oxides Ln2O3, Pr6O11 and Tb4O7 with formation of the intermediate Ln2(C7H4O4)3. The lanthanum complex decomposes
to the oxide in three steps forming La2(C7H4O4)3 and La2O2CO3 as intermediates and the Ce(III) complex decomposes directly
to CeO2. The properties of rare earth 2,5- and 2,4-dihydroxybenzoates have been compared.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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水合稀土二氯醋酸盐的合成及热分解研究 总被引:1,自引:0,他引:1
合成了La,Ce,Nd,Sm,Eu,Gd二氯醋酸盐,经化学分析,热重法和五氧化二磷真空千燥脱水法确定组成为Ln(CHCl2COO)3.nH2O(n=2,Ln=La,Ce,Nd;n=1.5,Ln=Sm;n=1.25,Ln=Eu;n=1,Ln=Gd),它们均属新水合物.用DTA-TG-DTG并用技术并辅以化学分析和红外光谱技术研究了其热分解机理,实验证明,由室温至600℃范围内,它们均发生三步主要反应:水合盐脱水变为无水盐;无水盐分解为中间产物,Ln2(OH)Cl5.3H2O[Eu盐分解为Eu2(OH)Cl5.2H2O];中间产物进一步分解为LnOCl[Ce盐为CeO2].并观察到无水盐和氯氧化物形成温度皆与原子序数呈现镧系"双一双效应". 相似文献
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稀土硝酸盐与1,1,1-三(4′-二苯胺甲酰基-2′-氧杂丁基)丙烷配合物的合成及谱学性质 总被引:3,自引:0,他引:3
三角架型配体由于其独特的配位方式而具有许多优良的物理和化学性质 ,如能稳定高氧化态的过渡金属离子[1 3] ,用作优良的电极活性物质[4] ,具有生物活性[5] 等 .因此近十余年来对该类配合物的研究一直是配位化学研究领域的一个重要部分 .但到目前为止 ,对具有三角架结构的三酰胺型开链冠醚的研究却很少 ,且主要集中于研究它与过渡金属和碱金属离子的相互作用及其性质[4,5] ,有关该类配体与稀土离子的配位形式及性质的研究则更少[6] .为了进一步研究该类配体与稀土离子的配位能力及所形成配合物的性质 ,我们参照文献 [5]方法 ,合成出配体 1 ,… 相似文献
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P. Kanchana S. Packiaraj A. Pushpaveni S. Govindarajan 《Journal of Thermal Analysis and Calorimetry》2017,129(1):3-14
Oil-bath reaction of respective metal nitrate with an aqueous mixture of oxydiacetic acid (H2oda) and hydrazine hydrate led to the formation of crystalline compounds with formula (N2H5)3[Ln(oda)3]·2.5H2O (where Ln = La, Ce, Pr, Nd and Sm), which are stable for a week and undergo efflorescence. The resulting complexes were characterized by infrared spectral, thermal (air and nitrogen atmosphere), UV–visible and PXRD studies. From the thermal studies, both in air and nitrogen atmosphere, these compounds show endothermic dehydration below 100 °C to give anhydrous compounds. Next, the anhydrous compounds (in air) undergo endothermic decomposition between 190 and 225 °C to form Ln(Hoda)3 intermediate, which further show exothermic decomposition to yield respective metal oxide as the end residue. But, in nitrogen atmosphere, the same anhydrous compounds exhibit endo-followed by exothermic decompositions to give respective metal as end product. This is observed as a continuous single step of decomposition in TG. The structure of (N2H5)3[Nd(oda)3]·2.5H2O has been determined by single-crystal X-ray analysis. The neodymium atom is coordinated by nine oxygen atoms from three tridentate (O, O, O) oxydiacetate ions with tricapped trigonal prismatic geometry. In addition, both the parent acid and its compounds display strong fluorescent emission due to the ligand, which renders them as fluorescent materials at room temperature. 相似文献
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Hao XL Luo MF Yao W Li YG Wang YH Wang EB 《Dalton transactions (Cambridge, England : 2003)》2011,40(22):5971-5976
The reaction of a double-betaine-containing ligand with LnPMo(12)O(40)·nH(2)O (Ln = Dy, Tb and Er) led to the isolation of new polyoxometalate-templated lanthanide-organic hybrid layers with the molecular formula [Ln(L)(1.5)(H(2)O)(5)][PMo(12)O(40)]·1.5CH(3)CN·2H(2)O (Ln = Dy (1), Tb (2) and Er (3); L = 1,4-bis(pyridinil-4-carboxylato)-l,4-dimethylbenzene). All compounds were characterized by elemental analyses, TG analyses, IR and the single-crystal X-ray diffraction. Compounds 1-3 are isostructural and possess a 2D undulating cationic network [Ln(L)(1.5)(H(2)O)(5)](n)(3n+) with the honeycomb-like cavities. Interestingly, the interval 2D networks are further connected by the H-bonds to form a 3D supramolecular framework. Moreover, two of such identical supramolecular frameworks are 2-fold interpenetrated with each other and encapsulate the α-Keggin-type [PMo(12)O(40)](3-) anionic templates and the solvent molecules. These composite compounds display both luminescent properties (induced by organic ligands and/or lanthanide ions) and electrocatalytic activities towards the reduction of nitrite. 相似文献
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B. R. Carson G. Kenessey J. R. Allan G. Liptay 《Journal of Thermal Analysis and Calorimetry》1995,44(3):739-743
The chloro complexes of 2-amino-3-methylpyridine with cobalt(II) and copper(II) have been prepared in ethanolic solution and
solid compounds have been isolated. The compounds have stoichiometry ML2Cl2 whereM is Co2+ or Cu2+ and L is 2-amino-3-methylpyridine. Spectral and magnetic studies have been used to obtain information about the environment
of the metal ion in these compounds. The compounds have tetrahedral structures. The thermal decomposition of each compound
has been studied using thermogravimetry and differential thermal analysis. Thermogravimetry studies show that the cobalt complex
forms an intermediate compound before the metal oxide is produced while the copper compound undergoes decomposition with loss
of organic ligand and the formation of copper chloride which then decomposes to give an oxide of copper.
The enthalpy of reaction for each of the processes has been calculated from the thermal analysis curves. 相似文献
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RE(ClO_4)_3·nH_2O与丙氨酸、咪唑配合物的合成、表征及生物活性 总被引:1,自引:1,他引:0
研究了 9种RE(ClO4) 3·nH2 O与Ala(丙氨酸 CH3CHNH2 COOH)及Im(咪唑 )在甲醇中的配位作用。用化学分析、元素分析、IR、UV、FS光谱及X射线粉末衍射对配合物进行了表征。确定了其组成为RE(Ala) 2 Im (ClO4) 3·nH2 O (RE =Ce ,Sm ,n =2 ;RE =Pr ,Nd ,Eu ,Gd ,Tb ,Yb ,n =1)及La(Ala) 3Im(ClO4) 3·3H2 O。并结合1 HNMR及TG DTG进一步研究了新配合物的配位行为及热分解机制。生物活性测定结果表明 ,该类配合物尤其是重稀土配合物具有明显的广谱抑菌作用。 相似文献